Your pandemonium event:
>sensei visits pandemonium society
>he realizes makoto is plotting something and immediately snitches to hina
>chiaki takes a picture or something and disappears
>sagsuki hypnotizes a mob or something and disappears
>hina arrives and with the help of sensei forces makoto to kneel
>makoto's final lines of the event are "AIEEEEEEEE HINA-SAMA FORGIVE MEEEEE" or something to that extent
>ibuki says hina and sensei are her two most favorite people in the whole wide world
>iroha missing from the event (it's not explained why and she isn't mentioned once)
>everyone in the event gets a new costume